Dell have simplified the process of updating a Dell PowerEdge Server. All you need to do is burn the ISO and boot of it.

You can now download a bootable ISO customised for each PowerEdge server model which includes all the latest BIOS, firmware and drivers etc., this can be very handy for ensuring any Dell servers you need to manage are updated with the latest available BIOS, firmware and drivers etc.

The ISO can either create a bootable DVD or USB Key or it can be mounted in iDRAC virtual media and used to boot and update the server.
List of custom update ISOs for all Power Edge systems :